Dragonspiral Tower (Japanese: リュウラセンの塔Dragonspiral Tower) is an old tower where ZekromBB2/ReshiramWW2 was sealed in the Dark StoneBB2/Light StoneWW2 after the war thousands of years ago, until it was awoken by N. It is located in the western part of Unova, just above Icirrus City. Though it is not known who built it or when it was built, it is the oldest structure in Unova. It is said this is where legendary Pokémon are created and slumber.

ReshiramB/ZekromW can be found here after the credits if the player had a full party and PC when prompted to catch them at N's Castle, because players are not forced to catch them under these circumstances.

In Pokémon Black 2 and White 2, if the player brings the Dark StoneB2/Light StoneW2 to the top of the tower after receiving it from N, ZekromB2/ReshiramW2 will turn back into its regular form from its Dragon Stone form, allowing the player to capture it.